Electrical apparatus



E. DICKEY ELECTRICAL APPARATUS Aug. 16, 1932.

Filed July 29, 1929 INVEN TOR MM 0 B Y ATTORNEY manner jnrexnr, on

- s The calgenerating systems.

a Patented as. 16, 1932 1 1 Application-filedJuly 29,

Generating systems used for household purposes or farm lighting or the like are often ca1led *up'on to serve translating devices which require frequent operation such as a refrlgeratlng apparatus. The capacity of these translating devices are such whereby it isdeslrable to supply someof the energy directly from the dyn'amo of the lighting system, however, due to the fre: quent occurrence of a demandfor energy by i the translating device, it would be unecoingthexdynamo. 1 a 1 One of the objectsfoffithepresentinvention is to provide sin-electrical generating system including:electrical apparatus, such circuit. One manner of preventingthe operation of the systenimexcept upon, for example, everyother demand for current is to provide a switch responsive to a demand for circuit.

nomical to render the dynamo operative 'upon every demand by the translating device because of the energy required in startasa dynamo, and a storagebattery,which system will be rendered operative only upon intermittent deniandsyfor current by a work In carrying out this idea oftheinvention it is a further object; to provide means for causing the storage battery to supply a demEIIlCl forw current by the qwork circuit and for causing thesystem to be rendered operative to supply the current "demand upon alternate demands for currentby the work current by the work circuit for controlling meaty the dynamism amount equal to or more than one-half ofitstotal output while the workn machine contained in the work circuit-is operating therefrom. i

the necessary circuits for renderinglthelsystem operative, @whichswitch is adapted to render the system operative jonce for every two operationsthereof.

i It a furthenobjectto provide for supplying thestorage battery fwith charging curj Further objects and advantages of the present invention willbe apparent fromthe following description; reference being had to the accompanyng drawing, wherein a present invention qrelates to electrilarraim'rns 1929, serial No; 382,051, a

preferred form of the presentinveritionis clearly shown.

i In the drawing:

The figure inthe drawing is a wiring diagram illustrating the present invention;

Referring tolthe draWingQO designates generally a prime mover hereinshown, for a i the purpose ofillustration, asQaninternal combustionengine havinga shaft 21 which drives an electrical apparatus or dynamo221 having main brushes 23 and 24 connected to the armature of the dynamo and having a starting seriesufield winding 25 and a shunt field winding 26. i

The ignitionjapparatus comprises an:

tioncoil primary 30, an ignition timer 31 and an; ignition coil secondary which is connected toan engine spark plug 33.1 i i i A choke 88 forming a proper mixture of; gasoline andalr, for startlng theprime mov er,a11da throttle 39 for regulatingythe speed of the prime mover, are adapted to beactu atedby the controls 40 and 41 respectively,

a The dynamo 22 functions as 1a motor or as a generator, and is adaptedtorotate the shaft 21' ofth e prime mover 20,;when acting as a startingtmotor, receiving; current from astorage battery 45; During the starting of theprime mover 20, the current through the series winding 25 and the shuntwinding 26 is cumulative to produce a sufiicientstart ingtorque for cranking the primemover.

j-When the load demand on a lighting circuita4c8 is less than a predetermined value5the storage battery 45 is adapted to supply 1 such demand; The current to thelighting circuit a 48 will flow from the battery 45 throughthe following circuit: battery 45, wire 5O,w1re

51,Ywire52-, winding 53 ofcontrol ll, wire 55, contacts 57 and 58, service main59,sma 'll translating device or lights 60, service mean 61, current coil 62 of a starting switch relay 63, wire 65 and :wire :66 the battery.

to the other side "of A low voltage cut-out 7O adapted to separate contacts 57 and 58 when the voltage of the battery is abnormally low, The low voltage cut-oh. 7 0 includes apivoted armature 'i'lwhich carriesthe contact 58, and amagnet coil72 having. its endsconnected across the lighting ar na 48 1 1 pa uei with the trans- .lating devices 6-0. WVhen the voltage of the V 1 battery is, less than ai'predetermined low value, the coil '72will not' be energized su'fliciently to hold the armature 71 in the position shown in drawing Thus the armature 71 will descend by gravity to separate-contact 57 from contact 58, thereby interrupting thefiow; of current from the battery: 515 to .thework circuit48; v i When there is a loaddeniand forcurrent" f by the lighting circuit 48 in excess o iaprede termined value, for example seven amperes,

" thermostatic blade 82,,wire- 83, contacts 77 and 76, wire-85,, ignition; coil primary 30,

timer 31, wire 87, wire '88," wire 89, series winding of a reverse current .relay "91 and wire" 66 to the other side of the battery. The, closing of contacts76and77 also allows current to flowffrom thebattery 4:5 to a mage net coil 92 of a starting switch 93'. The start- 1 ing switch93includesthe coil 92 andapivoted I armature 943 which carries a contact 95. -Thelenergizing e1 1 ,the'-c0il*92 will cause thearmature '94 tobe drawn upwardly to engage contact 95fw ith acontact' 96. The circuit from the batterv45th'rough the coilf92 is asit'ollows battery 45, wire 50, wire80, blades 81 'and 82; wir83,contacts.77 ;and 76, wire 1 85,wir'e 98,1hagnet coil 92, Wire 99, wire 89,:

Winding 1 0, andvire 66 1 the other side of the battery." v

45" A startil'igf switch '93 establishes cranking ing circuit between the' 'battery andthe dynamdwhichis as'followsz battery 15, wire 50,

The closing of contacts95 and96 of the windin 100 of the control 40, wire10ljseries winding'25of dynamo 22, wire 102,1 dyn'an1o 22 wire'103, contacts 96 and 95, wire 89, series winding 90 of'reverse current relay 911 and "Wife66to the other'sideofthebattery;

f Q The current T flowing through the; series winding 90 of the reverse current relay 91 a during crankingis adapted to magneti ze the frame; of relay,91 includingjside plates or polepieces and 106 whereby said plates 105 and-106 will be, for example, northand south poles respectively. The relay 91 also-v includes rocking armature 108 having 1 a 7 shunt iwindingl09, which winding is @011 nected 'across the batteryASV The. circuit fromthe battery45 to the shunt winding 109 is as follows :1' battery 45, wire 50, fwirej8'0,

blades81 and 82, wire 83, wire 111, shunt 1 winding 109, wire112, contacts 96 and 95,

Wire 89, series winding 90 and wire 66to the other side of the battery. The armature 108 i includes side plates and 116 which plates are adapted-to be magnetizednorthand south poles respectively "by shunt Winding 109.

'VVhen no current is flowing in the windings '90 and 109.,armature'108 is in theiposition shown, it being resiliently held in such pO'Sltion a spring; (263). When the current flows, through the series winding 90 during cranking, like poles of therelay frame and armature will repelv and thus" urge the arma c0ntact121.

Thee'ngagement of jcontacts 120121 allows currentwtoflowcfrom the battery through the followingcircuit when contacts wire .50, wire 80, blades 81' and 82, wire 83,

contacts 7 7 and 7 6, wire-125., conductor 261 contacts 120and 121, wire 126', wire 127, shunt winding 128 ofthe starting switchrelay 63, then back tothe opposite side of the battery through the winding =62and Wires-65) and 66 also current from wire126 flows through Wire 129 to pre-heater 130 grounded at 131,the circuit being completed through, 7

76"and 77 of relay 68 are closed: battery 4-5,

no a

the ground "1 32, wire 133, wire 88, wire89 winding 9O a'nd wire66; and current also flows" from wire 126 through aheating coil ofja cranking 'cut-out136, wires 137 and 1 138, wire 89, winding 90 and wire66 to the other side of the battery. The pre-heater130 is adapted; to heatthe starting fuel mixture for the prime mover120. Duringlcranlring operationthe current flows through the shunt winding 128of relay'68 to cooperate with the current coil 62f'to insuremaintainingof con? tact between contacts -76;and77.

V 'The flow ofj cu'rrent through the/magnet 1 coil 100 of thechoke control 40 tends to raise the control plunger 140 upwardly which plunger carries the choke; 38. The upward movement of the plunger 140 will cause the chokef38 toshutoflt' theair passage 141, thus decreasing the "quantity of airand conse quently; allowing a greater volume of gaso- 11116 10 ,passthrough a pipe 143 and into the carburetor to thus provide. a relatively rich starting fuel mixture for the prime mover. The control-LO'is adapted to functionforfa A V 1 120 short interval, namely, only when a heavy de- 7 1 mand for current is made on the battery e5 present fora shortinterval. h v Thus when there is a predetermined dc-.

during cranking which heavy demand is mover 1 20 will be started by supplying igni tion theretoand cranking by the starting series field winding 25 in conjunctio-nwith thecshunt fieldwinding of the dynamo 2-2.

ture'108 in the same directionas the spring s 263 turns it, whereby: contact 120 engages I 125 mand by the. lighting circuit AS the prime if'l he lstarting jbeing aided byyenriching the fuel mixture and: heating suchmixture.

1 Ifthelprime moyer 20 should not start Within a certainlength of time, abnormaldischarge; of the battery" is prevented by the cranking cut-out; 136 which includes the iblade 81 Wandbimetallic thermostatic blade I 82 andthe heating cornea, The blade 81 is jfixedat 145 and has a non conducting block; 11 16secured thereto. The blade Ellisurged I ydownwardlylby afspring 1 17 to engag e a y flangedend l l8 of the bimetallicthermostatic f blaide82, said blade being fixed at 1453. The ;thern1ostatic blade 82 isin heat receiving ree lationqto the fheating coil 135. fWhile-the prime mover isgcranking current"is passingi through this heating coil askpreviouslyde scribed. Iffthe crankingof theprimemover "shol l q continue-for an'abnormal period, for 1 example,*one to: two minutes, the thermo static b1ajde 82 will bejheated sufficiently to 1 cause itto bowto thelrighh'as Viewed in the drawing, until the flanged end 1 18 moves to the'right far enoughtohreak its engagement with, the blade 1 81] [and 91s then retained in a shoulder 150 of the non-conducting block a, 146

. gbyf the downward movement of the blade 81. a The separation ofblades 81 and 82 will interrhpt the flow ofcurrent tothei gnition, shunt Winding, 128 ofre1ay; 63, shunt winding 109 rrevr e current mayor, heating coil 135 of the?cranking-output 136, the fuelpre heating @011 130 and the coil 92 ofstarting switch as;

Whenpoil 92 is deenergized the armature :91 ltjvill descend. gravity H to separate contact .195 from c mpetes; thus the starting circuit B wiltbeinterrupted; h

During normahoperation, when the prime moyerhloecomes self-operative and attains a certain speed the; dynamo function as a y a difl'erentially wound generator, the current gnawing roman a dynamo tothe battery over throughtheseries winding 90 oftherevcrse currentflrelayjfil Willfbe reversed from that during -crjanking, since L this Winding is, series with thedynamo 22 andbattery 45 and in series with the workcircuittllj This causesa reyersalgof;magnetism1n the relay flike pole of the j armature side plates 115' and IL side plates 105, and 1106, and consequently the 116 twill he met/ed may from the like; pole j closingof contacts 155 and156a11oW$ magnetcoil 160fof af seriesfield winding other side of the dynamo;

50, wire80,blades81 and 82, Wire 83, con-p tacts77 and 7 6,Wire 125, connector 262,fcon-' tacts 155: and 156, Wire 165, magnet coil 160," Wire 138, contacts 95and 96, Wire-103m the .The closing of contacts163 and 164 allows current to. flow from the lorush24 ofthe dynamo 22through the ire-167, contacts 163and 164, wire 168, andwire 51 which joins ithwire 5O andthusshort-circuits the series field winding25 of theldyna-mo 22 and the andcoil 100. 1 s a a a The dynamo 22then functions as ashunt "chokecoil 1OOK'of*the control410 sincethef "circuit just described offers less resistance thanthe circuit throughthe series field 25 Wound generatorand suppliesrurrent to the translating device or lights 60 inthe lightingcircuitAS and suppliedcharging-current tothe battery 45. Theflow of currentfrom the dynamo 22 throughthe work circuit is as 1 follows dynamo 22, Wire167, contacts 163 and"164;wire 168, Wire 52, magnet coil 53 of the throttle control 11, Wire 55, contacts 57 and 58, service m aing 59', translating devices 60,

Wire/65, Wire 66, series inding 90, Wire 89, contacts and 96 andywire 103. "lheflow of current from the dynamo 22 through the battery charging circuit is as followscdynamo 22, Wire 167, contacts 163 and 16 1,Wire 168, Wire 5l,"fwire 50, battery 45, :WlI 66,

96a-nd Wire 103.,

service main 61, current coil 62 of relay 6?), h

a "When the dynamo 225s operative to supply currentto the ,battery 45and Work circuit; 3 18, thecontrol tl functions to regulate the: a speed of the prime moverg2O to drive the dynamo 22't'o supply current in accordanceuwith the demand for currentby the Work circuit 1 a 1 8. The control ll includes the inding 53, a plunger operatively connected with the throttle 89, a spring, 171 interposed between the control housing 17 2and the plunger 151,0,

and a weight 173. Current flowing through the x vinding53tendstodraw theplungerfup-m ardly to open the throttle, While thefspring 171 tends to opposethe yvinding 53 tomoveu the plunger 17 OfdoWnwardly to close the I throttle. As the current through the Wind- V I ing 53 increases the ampere turns are thereby;

increased, consequentlythe magnetioet'fectiof the winding 53 will be increased sufliciently to move the plunger 170 upwardly to open the throttle to such an extent as Willhe nec- H essary to accelerate the prime mover 20 to drive thedynamo 22 tosupply current in ac cord ase Ito the deman b t W rk bifcuitserieswinding 90,, wire 89ycontacts95- and 5 weight 173 is adal itedito slightly over-balance l the weight of the plunger land 'holdthe same in contact withthe spring l7l-when t-he windingi53 is deenergized; By this arrange-- ment the plunger will he: moved; upwardly or downwardly by a steady movement de- 9 encl-ing upon the increase" orflclecrease-rof current in'the winding 53.. Sincetliewind ing 53iis dispo-sedin the supply circuit to" the service mai s, the speed; of "the prime 1 mover will be controlled in accordance to the demand bythe-workcircuit. I f 1 VVhen' it is desired-to supplya charging v current to the battery 45 and there is no load demand by the work circuit 48*for'rendering i i :clucles apivotedly mounted armature225a the prime moverautomaticallyoperative, an

actuating and locking device 175 maybe mane ually operated toengage contact 76*with: contact 7Ttojco1'nplete thenecessaryelectrical circuitsrfor starting theizprinie mover.- The locking device 17 5l includes' the plunger .17 6;

i r 'cross rod 177 whichis pivoted at lYS, said cross-rod having an arm 179 secured thereto 1 Land a lockingfclasp180."The downward unoveinent of the arm 179 Awill cause the plunger 176 to urgefthearinature 75 upwardly to engagecontact 7 6 with contact 77. The

i locking clasp 180 is adapted to receive th'earm 179 toh0ld the devi-ce in position tofprevent "contact a 7 6 from becoming separate-dfrom 'contact 77.

In the event that thejprilne mover '20 is idle; and thereis demand forcurrentby .thepowercircuit 200, ajs'witch202l is adaptedf to 'respond to'vsuch demand; However, the i relay 2O21is adapted for rendering the prime a mover 2Q; operative only -oninterinittent de- 1 'I'nands thepowerfcircuit although the reclay is actuated every time there is a demand forf current; In the} preferred embodiment illustrated the relay willcause thelprime mover I tolberendered operative only on everyotlier operation thereoi'i l 1 An: electric motor 204-; for example, is

shown connected; across'the power.- circuit 200 9116." is used; for example, foi driving a refrigerator compressor, and is Controlled by a the switch 205. The switchf20 5 includes a" sbel shar ng P Pel20 ;-w h P pe fnay be connectedtoanydesirable partoii i the refrigerating; "cont-r01 systenijj As the fpressiire within thecontrol system reaches predetermined valueytl e' bellows QOTj Will actuate ;a rodj 265 aloout ipivot 266 which in turn moves. member 209 to actuate member 269 through pivots 267 andj2 v8 to engage a contact 210" with; a contact21l. Eorgthe .tery 45.

side of the 'battery.

i i 1,871,881 l;

understood that any SVitllibhriWhGtllGIh auto j: i I

matic or'manual'l'y; operatedjlnay-loe used. V i

VThe closing of contacts 210 and211will complete a circuit between; the motor 204 "cone tained in the power circuit 200 and the ba t- The circuit IIEIOHI the battery 4:5, -through the power circuit2O0iisasfollows:A

battery 45, wires 50, 51 and c52, winding 53 of control 41; wire;;55, contacts 573116.758}? servicemain 59, service main 215 including? contacts 210 and'211', Iwi re 217, service main; 220including currenti-coil22l to theother The 'energization of 'currentcoil 221 is adapted to cause the operation of the relay 202. -.The relay 202is'adapted tocontrol the; j "necessaryqcircuits" for rendering the systeni operative, and in the preferrcol embodiment (it renders the systemoperative oneveryother operation otthe relayl The relay202-in which has-a1non-conducting block 225 s'ecured. thereto which blockvcarriesa finger 226 pivotedly mounted thereon and having a with a contact 246, and also tocausethe "cam 229 to rotate one-eighth'ofa turn inthedirection indicated on the drawing. thearlnature 225 moves upwardly, thedetent 212T will engage oneof-the studs 232, tothus rotate: thecanr; As shown in; the drawing'one 'of the flat portions 230 of tliecam 229 is engage 111g a,blac le"235.; lVhen thecam229rotates,as1 just described; one of theoutwardly extending ice blade 235 -andcausethesameto move to f right, as viewed in the drawing, thereby GIL-i] gagingethe blade-235 with a contact 236, i 11h sary eleetri'calcircuitsfor rendering the prime mover. operative includinga circuit through the magnet 00il192 ofstarting switch193, ig- 5 nition, preheater; shuntj winding 128x01 re 1ay63, and heating coil 1350f cranking cute u out 5 136. VThe 'ci'rcLiitirom 1 the battery 'to the contacts 235 and 236jand thecircuit for starting the, prime nOVer is as follows bats tery."45,-wires}-5O and 180, blades 81 and 82,

Wires :83, 111,240, contacts 245' and 2416, contnecting-point 247, contacts 235 and 236; blade 234; to connecting point'24 9, wire25O to armature where the wire 250 joins wires 85 and; V 125, the current flowing through wires j 85 and to the various circuits necessaryifor i V i V i i starting 'the prime nover aspreviously def; "purposeoig llustration, I havesho-wn a presf ure r spc sl e swi hi hene er, it steg c scribed. After the side of thedynamo. ,The dynamo 22may be f -regulated sothat when current isbeing supoperatiize, the dynamo 22 will supply current J What is claimed is as follows: it v to themotor 2% over thefollowing circuit:

dynamo 22, wire 167,contacts l63 and 16%,

wire 55, contacts 57 and 58, service main 59,

service main 215 including ContactsQlO and t 211, wire2 16, motor 204, wire217, service ,ma1n22O ncluding current coil 221, wire (SfC WindingQOcf relay 91, wire 89, contects 95 and 96, and wire 103 to the other plied to, the'device 2% an amount of current equal toor'morethan one-half ofthc a p total output ofthe dynamo is being stored in t the battery d5, thecurrent flowing "to the buttery over the batterycharging circuit pre- -viously described; llnvthismanner theibat- L tery A5 is always maintainedin operating condition tooperatethe motor-204 when supplymgcurenttothe motor. r

When the demandforcurrentbythe pow-p er circuitQOO ceases, the current coil 221 be comes deenergized, thereby causingthe armat1 1re225 tojdescend to -separate contacts 245 and 246, thereby interrupting the necessary electrical circuits for maintaining the prime mover operative. As the armature deascends the finger 226 will move downwardly while the detent227 Will be urged to the 7 right as Viewedfin the drawing,by a spring i 255 to engage a stud; 232. Thus it willbe notedthaton the next demand for current i by the power circuit 200, thelcain 229mm fagain rotate one-eighth turn and hose doing Kcne of the hat portions 230 of the foam 2:29 will again engage the blade 23%, thus the blade 234: will assume the position shown in a thedrawingfand in so doing will separate contact 235 fromcontact 236. The sapara it tion of contacts235 and 236 willinterrupt the necessary circuits for starting thepriine 1 niover although the contacts 245 and 2&6

1 terry, whiclrsystem is adaptedto berendered are closed. The battery t5wwill then supply 'he demand by themotor 204 oyerithe circuit automatically} operative only upon inter1niti a tent demands for current by thEE-WOIkClI'CHIt.

One of the adyantagesof a system operable only on interinittent demands is that the number of starting bperationsris decreased, therebypreventinga heavy drain upon the battery by numerous demands; for cranking tcurrent. ,Another advantage isthat less op-pl eration of the inga saving of fuel, t l l r t Whilethe form of embodiment of the in:

system isfrequired, thus causentionas herein disclosed, constitutes a preferred form,itlistobe understoodthat other i thejscope of the claims which follow formsmightvbe adopted, all co ing within demands; a ,4 i l a 4. An electrical generating system 'comprising, in combination; an intermittently operating work circuit; a source of--current connected {with the workmircuit; a second W source of current; j a control circuit for iren dering the second source of current operablef .1. An electrical: generating system comi v prising, in combination; can intermittently a wires 168 and 52,,w1nd1ng 53 ofcoiitroliL,

operating work circuit, a; source of; current prising, in combination an intermittently is operating work circuit; a sourceof current x connected witlrthe work circuit; a second source of current circuit connections between the first source and the: second source for rendering the second source of current operable to supply current to the work circuit; and meansFadapted-to render the sec ond source of lcurrent operable' onlyon al- 3 ternate demands for currenthy the work circuit. w a i i i i wu3pAn' electrlcalr generatlngisystem comprisingt -i11' combination; an intermittently operating work circuit; a source of current 99 connected with the work circuitya second source of current; circuit connections between the first source and thesecond source 3 i for rendering the second source of current operable to supply current tothe work c1r- \cuit; and means responsive to demand for -current by the work c rcuit for rendering the second source operable fonly 3 on alternate to supply current to the work circuit a relay f for controlling the control circuit; andmeans responsive to a demand ior currentbythe g1 i work circuit for causing therelayto close the control circuit only on alternatedeiuands 7110 forcurrentby the work circuit,

5.An electrical generating systemflcom prising, n comb nation; an intermittently operatingworkcircuit; a source oi current r connected with the work c1rcu1t;] a second 5 source of current;c1rcu1t connections between r g the firstsource and the lsecond sourcefor a rendering the second source of current operable to supply current to the work circuit;

a a control circuit for controlling the operation for the second source; a relay for controlling the; control circuit; andmeans responsiveto a demand for current by thelwork circuit for causing the relay to close the controlcircuit only onalternatei demands for current by 25 theiwork circuit. f j a i GJAn electrical generating SystembOm-f prising, in combination; an intermittently operating work circuitcontaining a-trans'lats ting device; astorage battery connected with 139;

the work 1 circuit"; an electrical" apparatus 51 l 7 adapted to operate as a, generator to. supply 1 u currenttothe Workcircuitiandforsupplying H the storage battery withchargingLcurrent-in an amountequel toormore than one-half of; r r its total outputwhile the translating device is opierating therefrom and means responsive to a demand forlcurrent'bythework circuit V for rendering the electrical apparatus operable only on alternate demands}. I I7. electrical generating system com- ;gprising in combination; ell-intermittently! r r l operating Work circuite sourceoztcurrent t connected tothe'work clrcuiuesecond source 7 "of current adapted to supply current toggthe u -work circuit,and1fnea;ns adapted to renderthev i I r second source? of current operative. to supply current totheworkccircuitonlyufter a pre- I determhaedlnumber' ofdemandsfforicurrent byth-e Work circuit; r

j 85 Anelectricel eneratingivsystem, comprising H in combination; intermittently, operating Work circuit, a, isourceuof current connectedto theWor-k circuit, a second source i l -1otcurrent adapted tor-supply current-to the Work circuit, and,meens'responsiveto a dem'and'for currentforjcausing the-firstnemed source of current to supply the demand 130 the Work circuit, saidmeans.also loeingen j ranged for causing saidsecond source of current to ;supply "the, demand to the Work cir 1 cuitonlya fter' a predetermined numloer of; it jdemandsby the WOIkCiI'Cuif/h 1 f f; r u I19, An electrical generating system licom Q prising in {combination an intermittently operating Work circuitQ-a source oficurrent connected tothe ork circuitfesecond source l ofrcurrent adaptedtovsupply current tothe 1 \Workjcircuiu;endmeans responsive to a demend for current ladaptedto l'rend'er the sec- 0nd source of current operative tosupply u c current to the Work circuit onlyaftrthe first or 1 jnemedsource'of current has been rendered i I h operetiveiandafter thecessation'ofthe first- 451 demand, said meansalso beingerranged to i render the first namedsource lo f current operativein response to a demandforcurrent'fl lbythework circuit after saidlsecond source of current has been rendered operative 1130 9 V supply the demand e predetermined number it of-times. i Y

Inytesti'mony-whereof hereto aflix m'y- '7 signature.x-' T i V: I V l 

